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PLAAF: News & Discussions

Discussion in 'China & Asia Pacific' started by MiG-23MLD, Feb 24, 2014.

  1. Gessler

    Gessler BANNED BANNED

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    What are exactly the changes/improvements between J-10B and J-10C?
     
  2. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    Hawk Wang and Gessler like this.
  3. Agent_47

    Agent_47 Admin - Blog IDF NewBie

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    [​IMG]
    The J-15 got bird strike after taking off carried over 8 ton fuel, 2 PL-8, 2 YJ-83K, which exceeded the limitation of MLW 5 ton.
     
  4. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    This is a excellent landing from the Chinese pilot in such kind of bird strike accident.
     
  5. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    Chinese manufacturing technology with 3D laser printing, is already leading in the world.

    ------------------------------------------------------------------------------------------------------------


    China developing world's largest 3D printer, prints 6m metal parts in one piece


    Feb.7, 2014
    https://www.3ders.org/articles/2014...nter--prints-6m-metal-parts-in-one-piece.html
    The aerospace industry is an important market for the production of 3D-printed parts. Boeing uses additive manufacturing extensively to produce environmental control system ducting for directing the flow of air on military and commercial aircrafts. Boeing has used 30 3D-printed parts, including environmental control ducts (ECDs) that carry cool air to electronic equipment on its luxurious Dreamliner. These ducts have complicated shapes that formerly had to be assembled from numerous pieces. But with 3D printing they can be printed in one piece, saving time and cost – at a savings of 25% to 50% per part in the process.

    As the world's largest manufacturing country, the development of 3D printing technology is important to China. China believes that 3D printing technology will promote the upgrading of the aircraft industry.

    [​IMG]

    Since 2001, China began to focus on the development 3D laser printing technology to make titanium alloy structural components.

    J-15 chief architect Sun Cong revealed that 3D printing has been widely used in designing and producing its military aircraft, from the J-16 fighter to the next-generation J-31. The latest carrier fighter prototype which had its first successful test in October and November 2012, used a 3D printer to manufacture its critical titanium alloy load-bearing structure on the aircraft, including the entire nose landing gear.

    [​IMG]

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    A large 3D printed titanium part for J-20 or J-31 stealth fighter

    Aeronautical materials expert Wang Huamin says China only needs 55 days to "print out" the main windshield frame of a C-919 commercial jet and the parts cost less than $200,000. By comparison, it could take at least two years and US $2 million for a European plane manufacturer using traditional methods.

    Wang's team at Beihang University created the world's largest 3D laser printer so far. The team used rapid prototyping technology to produce titanium alloy landing-gear and a large main force-bearing frame for the C919 aircraft which was printed as one piece.

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    Beihang University invented a new series of 3D printing technology and related software, effectively overcoming metal material deformation, warping, cracking and other problems. In addition, the high-energy laser melts metals into liquid at temperatures of up to several thousand degrees Celsius, requiring a specific oxygen- and nitrogen-free environment.

    The traditional approach is to build a large vacuum chamber with the machine, printer, etc inside. The researchers invented new equipment to put 3D printed parts in the protective chambers that only need to be similar in size to the parts. This equipment is convenient, easy to maintain and inexpensive.

    Recently, some of the complex, titanium alloy structures produced by Beihang has been approved for use in nuclear power plants and onboard satellites and rockets.

    [​IMG]

    In northwest China, the State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (NPU) began its research on Laser Additive Manufacturing (LAM) in 1995. The emphasis has been focused on obtaining excellent mechanical properties for LAMed metal parts through careful control of the material microstructures. The material of LAMed parts includes titanium alloys, superalloys, and stainless steel.

    [​IMG]

    In 2013, NPU manufactured a 5 meter long central wing spar with Laser Additive Manufacturing technology for Comac C919 passenger-plane which is expected to be finished in 2014 and to enter commercial service in 2016. A forged part weighs around 1,607 kg, the part produced using laser 3D printing technology weighs only 136 kg and saves 91.5 percent of the materials. Tests show 3D printed parts peform better than the forged parts.

    Large 3D printer, with1.8 meter build diameter
    China has been focused on developing large-scale 3D printing technology, which, as Wang Hua Ming said, has already surpassed the United States. Back in 2011, Huazhong University of Science and Technology research team in China successfully developed a selective Laser Sintering machine with build volume of 1200mm x 1200mm.

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    In June 2013, Dalian University of Technology and Unit Science and Technology Development Co. Ltd. developed a laser 3D printer with the maximum processing size of 1.8 m. The building area of this 3D printer reaches to 1.8 x 1.8 x 1.8 meter. With its unique technique of "contour scanning", this 3D printer will shorten processing time by 35% and reduce manufacturing costs by 40% compared to other types of laser 3D printers, according to the team. This laser 3D printer can be used to make casting moulds for large industrial prototypes with complex structures.

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    Largest 3D printer in the world, capable of printing 6m metal parts
    In November 2013, Nanfang Ventilator Co., Ltd announced its largest 3D printing device into the installation and commissioning phase. This will be the first large-scale realization of 3D printing technology. This 3D printer is expected to start production by the end of February 2014, and will also be the world's largest 3D printer for products and equipment.

    According to the company, the equipment is 28 meters long, 23 meters wide, and 9.5 meters high. The printer produces heavy metal components with a maximum diameter of 6 m and weighing up to 300 tons.

    These parts made using 3D printing have shorter production cycles, lower costs, high performance, and other advantages. They can be used in important manufacturing applications in industries like nuclear and power, petrochemical, metallurgy, shipbuilding, and others.

    The suitable materials for this 3D printer will include carbon steel, low-alloy steel, stainless steel and others. Low-alloy steel products are used primarily for nuclear and power applications, including nuclear pressure vessels; while carbon steel is mainly used for parts in generating thermal and hydropower.

    This 3D printer makes objects with the following specfications:
    Diameter : φ2100mm ~ φ6000mm
    Thickness : ≤ 800mm
    Length : ≤ 10000mm
    Maximum weight : ≤ 300 tons

    [​IMG]
     
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  6. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    http://news.sina.com.cn/c/nd/2017-10-05/doc-ifymrcmm8426498.shtml

    Chinese Rhenium nickel alloy single crystal blades used for turbo fan engines


    One private enterprises, called "Refining the stone in colors"

    In 2010, in Luonan County, Shaanxi Province, Huanglong, the company discovered rhenium in the molybdenum mine exploration. Reserves reached 176 tons, accounting for about 7% of global reserves, has aroused great concern at home and abroad.

    In order to find more rhenium,this private company's subordinate, the Chengdu Aerospace Super Alloy Technology Co., Ltd. and Hunan Institute of Nonferrous Metals , cooperate together for more than a year to overcome the technical problems and achieve the rhenium purification.

    However, sitting on such a scarce resource, they have found: this rare metal in the country is almost no market -since the domestic rhenium development and utilization is almost a blank!

    In desperation, they turned their attention to the international market and hope to use the model of resources exchanging for technology, and seek the cooperation with foreign companies such as alloy manufacturing.



    As the technological blockade of the other countries and the strategic importance of the aviation engine, it needs for a breakthrough. As a result, the company decided to produce its own single-crystal blades.

    The aviation industry investment is huge, period is long and return is slow, and single crystal blade is the most difficult parts in the manufacturing of turbo fan engines since the process is long, the pass rate is the lowest and the foreign blockade and monopoly is the most serious.



    With the help of government's "thousands talents plan" , the company invited a dozen foreign top experts - they have worked in several major well-known aircraft engine company, has many years experience in aircraft engine parts R & D, manufacturing, installation testing and quality control.

    But the equipment is lack of. After several twists and turns, they finally found a British single crystal furnace suppliers to solve the problem.

    So, by the end of 2013, in Chengdu, Shuangliu suburbs of the original barren land, the Chinese domestic single crystal blades start to sprout.

    July 22, 2015, Chengdu Aerospace first batch of products released, qualified rate was stunning.

    In 2016, the international authority of the third party testing organizations issued a test report shows that Chengdu Aerospace Super Alloy Technology Co., Ltd. for inspection of single crystal blades in the high temperature tensile properties, high temperature durability and other aspects of the test results are in line with European standards.

    Chengdu Aerospace has thus become the first domestic enterprise of single crystal blade mass production level .

    So far, single crystal blades into production time is just a year.

    Single crystal blades as the most core components in the turbo fan engine, the successful mass production is very important to the Chinese aviation industry.
     
  7. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    http://mil.news.sina.com.cn/jssd/2017-10-05/doc-ifymmiwm5585286.shtml

    Chief Designer of J-20 turbo fan engine, Gan Xiaohua, Academician of China Engineering Academy, said :

    China's military use aviation engine is generation or even more behind the most advanced level in the world .

    China is changing this pattern, in 2016, China launched the implementation of aviation engine and gas turbine projects, direct investment of not less than RMB 100 billion, the total investment will reach RMB 300 billion yuan(USD 45.11 billion). Aviation engines R & D and manufacturing have become a national strategy.

    In the past, as not engough money and needed urgently by the defence industry, Chinese aviation engines were produced with reverse engineering and imitation for military use. Now it is not the same. doing basic research and innovation is very important. Based on the strong basic research and a variety of technological accumulation, the development of a new engine does not need to spend 10 years like before, and it will only take 2-3 years to complete. The good example is the new WS-10B turbofan which used to power J-20A is developed based on WS-10A turbo fan engine.
     
  8. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    Based on the above Chinese technological developments and the huge government funding(RMB 300 billion yuan=USD 45.11 billion), it is expected that China can surpass Russia in 5-8 years in Turbo fan engine technology, and catch up the USA in 15-20 years.
     
  9. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    No.15 J-20 in test

    [​IMG]
     
  10. Sancho

    Sancho Lt. Colonel IDF NewBie

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    There is a dedicated section for Chinese fighters and developments, please keep this thread on topic or post the infos in the appropriate threads.
     
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  11. Sancho

    Sancho Lt. Colonel IDF NewBie

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    http://www.indiandefencereview.com/...plaaf-presence-in-tibet/#.WflHwI3F9EU.twitter

    Pretty good article, with a lot of details.
     
  12. HariPrasad

    HariPrasad Lieutenant FULL MEMBER

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    J series is a piece of Junk. Comparing SU 30 MKI in same league of J10 or J11 is a big joke.
     
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  13. HariPrasad

    HariPrasad Lieutenant FULL MEMBER

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    Your so called AAM is a piece of junk and at the most target big civilian planes. Neither your radar can detect small plane like tejas at 300 KM or even at half of the distance. Neither your missile can home on to it. So called 300 KM range at 30 KM altitude is a joke. No fight takes plave at 30 KM altitude. It happens at 6 to 7 km or even less. At that altitude, your AAM's range shall be reduced to less than half. Your bulky missile can not maneuver to chase highly agile small planes. So keep dreaming. Astra is much superior to anything you have in your inventory. Astra II shall be simply unmatched and much better than anything you can come up with incoming few years.
     
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  14. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    Chinese 4th generation twin engines jet fighter J-16 and 5th generation twin engines jet fighter J-20 photo

    The size of two jet fighters are similar.

    [​IMG]

    [​IMG]
     
    Last edited: Nov 6, 2017
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  15. RMFAN

    RMFAN Lieutenant FULL MEMBER

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    America Is No Match for China's New Space Drones
    http://nationalinterest.org/blog/the-buzz/america-no-match-chinas-new-space-drones-23039
    Eugene K. Chow
    November 4, 2017

    TweetShareShare
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    In a major breakthrough, China has unveiled a formidable new high-altitude drone that could give its military a significant advantage.

    Designed to operate in “near space,” 12.5 miles above sea level or higher, China’s new drones can break through air defenses, avoid radar detection, and collect valuable intelligence while staying well beyond the range of anti-aircraft fire.

    Operating at these heights has been a challenge that has long eluded engineers. Dubbed a drone “death zone” as the air at this elevation makes it difficult to generate lift and extremely low temperatures cause electrical equipment like batteries to fail.

    Until now, the U.S. military’s RQ-4 Global Hawk has been the highest-flying drone, operating at altitudes of 60,000 feet. But in a recent test, Chinese engineers surpassed that, flying an experimental drone at 82,000 feet.

    At a research facility in Inner Mongolia, two drones were attached to a weather balloon and deployed at 30,000 feet and 82,000 feet. Roughly the size of a bat and weighing about as much as a soccer ball, the drones were launched by an electromagnetic pulse sling shot that catapulted them out at 60 mph.

    The drones coasted to targets over sixty miles away, automatically adjusting their flight path and sending data back to a ground station. Most notably, due to their small size, they were barely detectable on radar during their test flight.

    The drones were equipped with several sensors, including a terrain mapping device and an electromagnetic signal detector that would allow it to pinpoint military troops. However, the drones could not carry cameras, as that would require a bulky antenna to transmit photo or video data, which would throw off its delicate aerodynamics.



    Its wings and body are seamlessly blended into a flat, tailless design that generates lift in the thin atmosphere of near space. Some models, like the two recently tested, do not have engines, instead drifting to their targets like a glider.

    “The goal of our research is to launch hundreds of these drones in one shot, like letting loose a bee or ant colony,” Professor Yang Yanchu, the head of the project from the Chinese Academy of Sciences, told the South China Morning Post.

    Militaries have long sought to take advantage of near space as it offers an opportunity to gather intelligence over large-areas without the costs or vulnerabilities of satellites.

    As advanced militaries increasingly rely on satellites for everything from intelligence to communications to missile guidance, they have become high-priority targets during wartime, and are difficult to defend. Therefore, having near space vehicles capable of gathering intelligence, relaying data, and serving as a backup or even replacement satellites would be invaluable.

    But so far no country has been able to operate in near space, as most aircraft cannot fly at such high altitudes and it is too low for satellites.

    China has been actively developing new technology that would allow it to operate in this largely uncontested new frontier with its Scientific Experiment System of Near Space, a pilot program led by the Chinese Academy of Sciences.

    In June, China test flew a solar-powered drone at 65,000 feet. The massive drone, dubbed the Caihong-T4, has a wingspan of 130 ft and is designed to stay aloft for months at a time with minimal supervision.

    Not to be outdone, NASA currently holds the record with its Helios Prototype, which soared to nearly 97,000 feet on solar power.

    But unlike these prototypes and current high-altitude drones which cost millions of dollars, China’s newest high-flying drone would only cost a few hundred yuan.

    With these cheap, stealthy high-altitude drones, China has leapt ahead in the near space race.

    Eugene K. Chow writes on foreign policy and military affairs. His work has been published in The Week, Huffington Post, and The Diplomat.
     

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